support for putting vm images in custom locations

Change-Id: I685de4207f1f7f17264cc4ad2d81c3348ca20074
diff --git a/README.rst b/README.rst
index 1e42a95..454f465 100644
--- a/README.rst
+++ b/README.rst
@@ -574,6 +574,11 @@
 .. literalinclude:: tests/pillar/control_virt.sls
    :language: yaml
 
+salt virt with custom destination for image file
+
+.. literalinclude:: tests/pillar/control_virt_custom.sls
+   :language: yaml
+
 
 Usage
 =====